A3212ELH Allegro Microsystems Inc, A3212ELH Datasheet

A3212ELH

Manufacturer Part Number
A3212ELH
Description
Manufacturer
Allegro Microsystems Inc
Datasheet

Specifications of A3212ELH

Magnetic Type
Latch
Operating Supply Voltage (min)
2.5V
Operating Supply Voltage (typ)
2.75V
Operating Supply Voltage (max)
3.5V
Output Current
1mA
Mag Sensor Operate Point (g)
55Gs
Mag Sensor Release Point (g)
10Gs
Mag Sensor Hysteresis(g)
5.9Gs
Package Type
SOT-23W
Pin Count
3
Mounting
Surface Mount
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Not Compliant

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A3212ELH
Manufacturer:
ALLEGRO
Quantity:
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Features and Benefits
▪ Micropower operation
▪ Operation with north or south pole
▪ 2.5 to 3.5 V battery operation
▪ Chopper stabilized
▪ High ESD protection
▪ Sol id-state reliability
▪ Small size
▪ Easily manufacturable with magnet pole independence
Packages:
Not to scale
3211-DS, Rev. 10
DFN/MLPD (EH)
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
SOT23W (LH)
X
SUPPLY
DFN/MLPD (EL)
SWITCH
Functional Block Diagram
SIP (UA)
TIMING
LOGIC
Description
The A 3211 and A3212 integrated circuits are ultrasensitive,
pole in de pen dent Hall-effect switches with latched digital
output. These devices are es pe cial ly suited for operation
in battery-operated, hand-held equip ment such as cellular
and cordless tele phones, pagers, and palmtop com put ers.
A 2.5 to 3.5 V operation and a unique clocking scheme reduce
the average op er at ing power requirements to less than 15 W
with a 2.75 V supply.
Unlike other Hall-effect switches, either a north or south pole
of suf fi cient strength will turn the output on in the A3212,
and in the absence of a magnetic field, the output is off. The
A3211 provides an inverted output. The polarity independence
and minimal power requirements allow these devices to easily
replace reed switches for superior reliability and ease of
manufacturing, while eliminating the requirement for signal
conditioning.
Improved stability is made possible through chopper
stabilization (dynamic offset cancellation), which reduces the
residual offset voltage normally caused by device overmolding,
temperature de pen den cies, and thermal stress.
Continued on the next page…
Micropower, Ultrasensitive
Hall-Ef fect Switches
A3211 and A3212
Dwg. FH-020-5
GROUND
OUTPUT

Related parts for A3212ELH

A3212ELH Summary of contents

Page 1

Features and Benefits ▪ Micropower operation ▪ Operation with north or south pole ▪ 2.5 to 3.5 V battery operation ▪ Chopper stabilized ▫ Superior temperature stability ▫ Extremely low switchpoint drift ▫ Insensitive to physical stress ▪ High ESD ...

Page 2

... A3211EUA–T 500 pieces per bulk bag A3212EEHLT–T 3000 pieces per reel A3212EELLT–T 3000 pieces per reel A3212ELHLT–T 3000 pieces per reel A3212EUA–T 500 pieces per bulk bag A3212LLHLT–T 3000 pieces per reel A3212LUA–T 500 pieces per bulk bag 1 Contact Allegro for additional packaging and handling options ...

Page 3

A3211 and A3212 Package Suffix ‘EH’ Pinning (Leadless Chip Carrier Package Suffix ‘LH’ Pinning (SOT23W Dwg. PH-016 Pinning is shown viewed from branded side. Micropower, Ultrasensitive Hall-Effect ...

Page 4

A3211 and A3212 ELECTRICAL CHARACTERISTICS Characteristic Supply Voltage Range Output Leakage Current Output On Voltage Awake Time Period Duty Cycle Chopping Frequency Supply Current * Typical data 25°C and V = 2.75 V, and is for ...

Page 5

A3211 and A3212 A3211 MAGNETIC CHARACTERISTICS Characteristic Symbol Over Temperature Range –40°C to 85° South pole to branded side; B > B OPS Operate Points B North pole to branded side; B > B OPN ...

Page 6

A3211 and A3212 TYPICAL OPERATING CHARACTERISTICS OPS B RPS 20 0 -20 B RPN -40 B OPN -60 -50 - AMBIENT TEMPERATURE IN ° ° ° ° C 7.0 6 =2.75 ...

Page 7

A3211 and A3212 Low Average Power. Internal timing circuitry activates the IC for 45 μs and deactivates it for the remainder of the period (45 ms). A short "awake" time allows for stabilization prior to the sam pling and data ...

Page 8

A3211 and A3212 Operation. The output of the A3212 switches low (turns on) when a magnetic field perpendicular to the Hall element exceeds the operate point B (or is less than B OPS output is capable of sinking up to ...

Page 9

A3211 and A3212 D 7X 0.08 C 0.25 ±0.05 0.5 BSC 0.55 ±0.10 For Reference Only, not for tooling use (reference DWG-2861; reference JEDEC MO-229WCED, Type 1) Dimensions in millimeters Exact case and lead configuration at supplier discretion within limits ...

Page 10

A3211 and A3212 E 2.00 ±0. 0.08 C +0.07 0.25 –0.05 0.40 ±0.05 For Reference Only, not for tooling use (reference DWG-2865; reference JEDEC MO-229UCCD) Dimensions in millimeters Exact case and lead configuration at supplier discretion within limits ...

Page 11

A3211 and A3212 +0.12 2.98 –0.08 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact ...

Page 12

A3211 and A3212 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 2 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2002-2009, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; ...

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